1. Assistant Research Scientist, Yuma Agricultural Center, Univ. of Arizona, Yuma, AZ 85364-9623.
2. Soil and Water Scientist and Director, Yuma Agricultural Center, Univ. of Arizona, Yuma, AZ 85364-9623.
3. Associate Professor and Water Resources Extension Specialist, Dept. of Agricultural and Biosystems Engineering and Yuma Agricultural Center, Univ. of Arizona, Yuma, AZ 85364-9623.
4. Research Soil Scientist, U.S. Water Conservation Laboratory, 4331 E. Broadway Rd., Phoenix, AZ 85040.
5. Research Agricultural Engineer, U.S. Water Conservation Laboratory, 4331 E. Broadway Rd., Phoenix, AZ 85040.